/Engine/Plugins/FX/Niagara/Source/Niagara/Public/NiagaraGpuComputeDispatchInterface.h
Get access to Niagara's GpuReadbackManager.
[FNiagaraEmptyUAVPool](API\Plugins\Niagara\FNiagaraEmptyUAVPool) * GetEmptyUAVPool() const